biedess r



Nov. 10, 1959 A. R. BIEDESS 1 24,732

' BREAKER ROLLER FOR BORING HEADS 2 Sheets-Sheet 1 Original Filed March5, 1957 m m m m Anthony R. Bied'ess BY A ORNEY Fig. 2

A. R. BIEDESS BREAKER ROLLER FOR BORING HEADS Nov. 10, 1959 2Sheets-Sheet 2 Original Filed March 5, 1957 Fig. 5

INVENTOR. Anthony R. Biedess TTOIQNEV United States Patent BREAKERROLLER FOR BORING HEADS Anthony R. Biedess, Chicago, Ill., assignor toGoodman Manufacturing Company, Chicago, 111., a corporation of IllinoisOriginal No. 2,823,025, dated February 11, 1958, Serial No. 644,105,March 5, 1957. Application for reissue April 29, 1959, Serial No.809,896

Claims. (Cl. 262-33) Matter enclosed in heavy brackets [II appears inthe original patent but forms no part of this reissue specification;matter printed in italics indicates the additions made by reissue.

This invention relates to improvements in rolling core breakers adaptedfor use with mining machines of the rotary boring type, wherein a boringhead is provided with a plurality of radially-spaced forwardlyprojecting cutters adapted to form a series of concentric kerfs in asolid face of mineral, and with a plurality of rolling core breakersalso mounted on the boring head in radially spaced positions so as tobreak away the cores left between the previously formed kerfs.

It has been found in practice that the conventional form of core breakerhaving a continuous wedge shaped cutting edge about its periphery has atendency to slip off to one side or the other when working in certainkinds of mineral, as for instance, in salt. Attempts have been made tocorrect this tendency by making the circular cutting edge more or lessdiscontinuous, but this has usually led to other difliculties,principally because the cutting edge tends to fill up with salt so as toapproximate a continuous edge having reduced penetration and wedgingaction.

The object of the present invention is to provide a special form ofdiscontinuous cutting edge for core breaker rollers which isself-cleaning and produces more efiicient penetration than haspreviously been deemed possible, particularly where working in salt andminerals having similar properties.

The invention may best be understood by reference to the accompanyingdrawings, in which:

Figure 1 is a fragmentary front View of a cutter head of the type inwhich the invention is embodied;

Figure 2 is a side view in partial section taken alternately through thetwo cutter head arms shown at the top of Figure 1, to illustrate therelative radial positions of the cutters and the roller core breakersmounted on the respective arms;

Figure 3 is a detail cross section taken on line 3 of Figure 1;

Figure 4 is an enlarged perspective view of one of the core breakers;and

Figure 5 is a diagrammatic view showing the track or pattern of thecutting edge of the core breaker.

Referring now to details of the embodiment of the invention illustratedin the drawings, a cutter head indicated generally at in Figures 1 and 2has a plurality of radially extending arms, in the form shown herein oneset of arms 11 being provided with a series of radially spaced,forwardly projecting cutter supports 12, 13 and 14, each having cutterbits 15 along their forward ends for cutting a series of concentrickerfs 16, 17 and 18, respectively, in a mine face. A pilot cutter 22projects from the center of the boring head as usual.

A series of rolling cam breakers 19, 20 and 21 are mounted on the boringhead in trailing relation to the cutter supports 12, 13 and 14 so as toengage and break down, with a wedging action the cores A, B and C leftbetween the kerfs 16, 17 and 1-8, and the pilot cutter 22, as indicatedin Figure 2. In the preferred form shown herein, the core breakers 19,20 and 21 are rotatably mounted on separate arms 23, circumferentiallyspaced from the arms 11, but it will be understood that the corebreakers can be mounted on the arms 11, in trailing rela tion to thecutter supports, if desired.

Each of the core breakers consists of a disc mounted for free rotationon a shaft 26 supported at opposite ends in bearings 27, 27 fixed to anarm 23. Each core breaker has a pair of opposed frusto conical sidefaces 29 forming a generally circular, or wedge shaped peripherydefining a leading edge 30.

The leading edge is made discontinuous by forming alternately disposed,radially extending concave flutes 28 in the two conical side faces 29,each intersecting the opposite face 29 so that the leading edge 30consists of a series of concentric wedge portions 31, 31 interrupted byconcavely scalloped cutter wedge portions 32, 32 curved alternately inopposite directions. The scalloped wedge portions 32 form cutting edgesas sharp, or sharper than the higher wedge portions 31.

The flutes 28 are preferably of increasing depth toward the outerperiphery of the disc, as will be seen from Figures 3 and 4.

It will now be understood that, as each roller disc 25 engages a core ofmaterial, the scalloped wedge portions 32 cut alternately on one sideand then the other of the wedge portions 31 on the central plane ofrotation of the disc, so as to tend to stabilize the disc and cause itto run in a straight path. The track or pattern followed by the wedgeportions 31 and 32 of the disc or roller is illustrated diagrammaticallyin Figure 4.

Due to the scalloped shape of the cutting periphery of the disc orroller, the concave flutes 28 tend to spurn the material alternately inopposite directions as it is engaged by the disc, so as to afford aself-cleaning action for the peripheral edge of the roller, and alsogreatly increasing the penetrating and wedging action for breaking downthe solid cores.

Although I have shown and described a certain embodiment of myinvention, it will be understood that various changes and modificationsmay be made without departing from the spirit and scope of the inventionas defined by the appended claims.

1 claim:

1. A breaker roller for boring heads comprising a disc having opposedoutwardly converging side faces defining a generally circular wedgingperiphery, said side faces having radially extending concave flutesalternately disposed therealong terminating in concavely scalloped cutting wedge portions curved alternately in opposite directions andconnected with arcuate centrally disposed wedge portions of theperiphery.

2. The structure of claim 1, wherein the concave flutes are of graduallyincreasing depth near the outer periphery of the disc.

3. The structure of claim 1, wherein both side faces are frusto-conical.

4. A cutting head for a boring type mining machine comprising rotatablemeans, at least one pair of outer and inner cutter supports thereon,cutter bits on said supports adapted to cut radially spaced circularrecesses upon r0- zation of said means and leaving a projecting ring ofmaterial lherebetween, and at least one crusher roller mounted forrotation and in a location in which it contacts said ring of materialand rolls thereon at substantial distances from any 0) said recesses asthe machine advances said bits to produce said recess, said rollerhaving a shape forming a margin composed of aligned tooth-formingprojections circumferentially spaced along the outer margin of saidroller and having non-coplanar cutter portions alternately ofisetlaterally from said tooth-forming projections and having non=linearpenetration with the material being crushed. 7

5. A cutting head for a, rotary power shaft of a boring type miningmachine comprising a rotatable means having radially extending arms,supports for cutter bits near the ends of said arms adapted to producean outer circular her in the material being bored, a central pilot bitsupport adapted to produce a central pocket in said material, cutter bitsupports mounted relatively to the pilot bit support and the outercutter bit supports to produce an inter mediate circular kerf in saidmaterial, rollers supported for movements in paths between said outerand intermediate cutter bit supports, additional rollers supported formovements in paths between said intermediate cutter bit supports andsaid pilot bit support, said rollers having aligned circumferentiallyspaced marginal cutter portions adapted for rolling contact with saidmaterial intermediate said kerfs and said pocket, and havingintermediate cutter portions between said marginal cutter portions, saidintermediate cutter portions on each roller being alternately ofisetlaterally from said marginal cutter portions on 0pposite sides thereofto produce non-linear penetration of the material being broken.

'Cartlidge Feb. 2, 1954 Robbins Oct. 16, 1956

